Synthetic polyolefin lubricant oil

Chemistry of hydrocarbon compounds – Adding hydrogen to unsaturated bond of hydrocarbon – i.e.,... – With preliminary diverse conversion

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585 10, 585 12, 585300, 585510, C07C 200, C07C 204

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active

051719088

ABSTRACT:
The invention is directed to method of making a thermally and oxidatively stable lubricating oil having a high viscosity index and a low pour point by the thermal polymerization of 1-olefins containing 8 to 10 carbon atoms, the preferred 1-olefins are 1-decanes. The polymerization is conducted at temperatures ranging from 280.degree. C. to 350.degree. C. and low pressures, of less than about 280 psig, in a reactor which is free of catalytic material. Thereafter, the polyalphaolefin is hydrotreated over a nickel catalyst, preferably nickel on Kieselguhr. In an improved process the polyalphaolefin is separated from a low molecular weight product by distillation. The low molecular product contains unreacted 1-olefins which are recycled to the thermal polymerization zone to produce more of the lubricant base stock. The remaining lower molecular weight olefinic materials which include mixed olefins, paraffins, cracked olefins and olefin dimers are routed to a polymerization zone to make a second lubricant base stock.

REFERENCES:
patent: 2000964 (1935-05-01), Lenher
patent: 2111831 (1930-03-01), Batchelder
patent: 2500166 (1950-03-01), Seger et al.
patent: 2706211 (1955-04-01), Clark
patent: 3883417 (1975-05-01), Woo et al.
patent: 4124650 (1978-11-01), Olavesen et al.
F. M. Seger et al, "Noncatalytic Polymerization of Olefins to Lubricating Oils", Industrial and Engineering Chemistry 2446 to 2452 (1950).

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